[YouTube-API] Redirect to a different Url after authentification

We have a Youtube direct instance located at
cinemundodirect.appspot.com. We Include that in an iframe on our
domain. When the user authenificates using authsub, however the user
is redirected to the appspot domain. I tried to change the next
parameter using the Java Authenticator.java class

loginUrl = AuthSubUtil.getRequestUrl("http://mailling.neuralis.cl/
cinemundodirect/index.html", SCOPE, secure, true);

But the authsub request is not valid. then.

How can I achieve a redirect to another domain after authenification?

Thank you , Dennis

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